CN102012169A - Method for secondarily recycling smoke gas waste heat of continuous annealing furnace - Google Patents
Method for secondarily recycling smoke gas waste heat of continuous annealing furnace Download PDFInfo
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- CN102012169A CN102012169A CN2010106089364A CN201010608936A CN102012169A CN 102012169 A CN102012169 A CN 102012169A CN 2010106089364 A CN2010106089364 A CN 2010106089364A CN 201010608936 A CN201010608936 A CN 201010608936A CN 102012169 A CN102012169 A CN 102012169A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for secondarily recycling smoke gas waste heat of a continuous annealing furnace, belonging to the technical field of a band steel continuous annealing furnace, and being expansively applied to the smoke gas waste heat recovery in other fields. The method for secondarily recycling smoke gas waste heat of a continuous annealing furnace is characterized by the following step: performing heat exchange between the low temperature smoke gas generated after primarily recycling the smoke gas waste heat of the continuous annealing furnace and the cooling return water after the water cooling roller of the annealing furnace is cooled through a heat exchanger of a secondary recycling system, wherein the cooling return water passes through the heat exchanger for heat exchange and then is heated and sent to a cleaning section for use. The method not only saves heat energy but also saves a large quantity of cooling water in the cleaning section, and simultaneously reduces operation cost.
Description
Technical field
The present invention relates to the method that a kind of continuous annealing furnace flue gas exhaust heat is recycled for the second time, belong to the continuous strip annealing furnace technical field, can expand the flue gas waste heat recovery that is applied to other field.
Background technology
After a waste heat recovery of Qi gas heat exchanger, annealing furnace burnt gas flue-gas temperature has dropped to about 400 ℃, because heat content is lower, handle at present " low-temperature flue gas " most way to be to mix a certain proportion of cold air in flue gas, directly discharging after its temperature reduced to about 250 ℃ that satisfy the blower fan requirement, waste a large amount of heat energy so virtually, also increased the load of smoke exhaust fan simultaneously.
For the radiation tubular heater, it is carrier with " superheated water " that employing is also arranged, and to the about 400 ℃ of modes that left and right sides fume afterheat reclaims once more after the heat recovery, other operations of unit such as users such as cleaning section, heated-air drying section provide thermal source in order to anneal.
But this waste heat secondary recovery utilize mode because of " superheated water " pressure medium up to 0.5～0.7Mpa, therefore whole system is comparatively complicated, control accuracy is had relatively high expectations, and equipment such as heat exchanger, expansion drum need professional pressure vessel producer to make, and the whole system investment is higher.This system seldom uses at the NOF direct firing furnace in addition, because cause the fluctuation of NOF furnace pressure easily in adjustment process.
Summary of the invention
" low-temperature flue gas " after recycling for the first time at the continuous annealing furnace flue gas exhaust heat, the method that the object of the present invention is to provide a kind of continuous annealing furnace flue gas exhaust heat to recycle for the second time, this method is not only saved heat energy, also saves the cooling water of a large amount of cleaning sections.
For achieving the above object, the technical solution used in the present invention is: the method that the continuous annealing furnace flue gas exhaust heat is recycled for the second time, it is characterized in that: the low-temperature flue gas after the continuous annealing furnace flue gas exhaust heat is recycled for the first time by the second time recycling system heat exchanger with the annealing furnace water cooled rolls carried out cooled cooling backwater carry out heat exchange, described cooling backwater carries out sending into cleaning section after heat exchange heats up through heat exchanger to be used.
The temperature of described low-temperature flue gas is 380～420 ℃.
Described second time recycling system comprise cool back water pipe 1, storage tank 2, mend new water pipe 3, magnetic valve 4, liquid level sensor 5, the first input water pipe 6, first check-valves 7, first water pump 8, first valve 9, heat exchanger 14, the 3rd valve 16, output water pipe 19, the 4th valve 21, flue gas input pipe 25, flue gas efferent duct 27; The input termination that cools back water pipe 1 is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output that cools back water pipe 1 is connected with storage tank 2, mend the input termination supplementing water source of new water pipe 3, the output of mending new water pipe 3 is connected with storage tank 2, mend new water pipe 3 and be provided with magnetic valve 4, storage tank 2 is provided with liquid level sensor 5; The input of the first input water pipe 6 is connected with storage tank 2, the output of the first input water pipe 6 is connected with the aqueous medium input port of heat exchanger 14, be provided with first valve 9, first water pump 8, first check-valves 7, the 3rd valve 16 successively on the first input water pipe 6, first valve 9 is near storage tank 2, the three valves 16 close heat exchangers 14; The input of output water pipe 19 is connected with the aqueous medium delivery outlet of heat exchanger 14, and the output of output water pipe 19 is connected with the hot water rinse bath 27 that is used for the cleaning section use, and output water pipe 19 is provided with the 4th valve 21, the four valves 21 near heat exchangers 14; Low-temperature flue gas after the continuous in succession annealing furnace fume afterheat of the input of flue gas input pipe 25 is recycled for the first time, the output of flue gas input pipe 25 is connected with the flue gas medium input port of heat exchanger 14, and the flue gas medium delivery outlet of heat exchanger 14 connects a flue gas efferent duct 27.
Be provided with second valve 13, second water pump 12, second check-valves, 11, the second valves 13 on the input of described first valve 9 one second input water pipe in parallel 10, the second input water pipes 10 successively near storage tank 2 with the output of first check-valves 7.
The described first input water pipe 6 is connected a bypass pipe 17 with exporting between the water pipe 19, and bypass pipe 17 is provided with by-passing valve 18.
Be connected to first delivery pipe on the described first input water pipe 6, the input of first delivery pipe is between the aqueous medium input port and the 3rd valve 16 of heat exchanger 14, and first delivery pipe is provided with first drain valve 15; Be connected to second delivery pipe on the output water pipe 19, the input of second delivery pipe is between the aqueous medium delivery outlet and the 4th valve 21 of heat exchanger 14, and second delivery pipe is provided with second drain valve 20.
The bottom of described storage tank 2 is connected with the input of the 3rd delivery pipe 22, the output of the 3rd delivery pipe 22 ditch of running in, and the 3rd delivery pipe 22 is provided with the 5th valve 23, the five valves 23 near storage tanks 2; The overfall of storage tank 2 connects the input of overflow pipe 24, and the output of overflow pipe 24 is connected with the 3rd delivery pipe 22.
The invention has the beneficial effects as follows:
1) this method is a medium the annealing furnace water cooled rolls is carried out cooled cooling backwater (" hot water "), after " hot water " that the temperature of original directly discharging is about 50 ℃ and the heat exchange of " low-temperature flue gas " after waste heat recovery process heat exchanger, all be fully utilized again, not only save heat energy, also save a large amount of cooling waters (cleaning section), kill two birds with one stone.
2) carry out waste heat recovery by this method and need not regulate flue gas flow, can not cause fluctuation, so this method can be applicable to the flue gas waste heat recovery of NOF direct firing furnace the smoke evacuation system furnace pressure.
3) this method is with flue gas and the required water direct heat-exchange of cleaning section user, and than the few one-level heat-exchange system of superheated water waste heat recovery mode, so heat exchange efficiency is higher, and heat loss is lower.
4) heat exchanger adopts the band fin-tube heat exchanger, and the equipment and technology maturation is safe and reliable, and pressure medium is lower, enters cleaning section if the generation seepage can switch to bypass with water rapidly, and is simple to operate.
5) water pump adopts the using and the reserved to arrange, improves the guarantee that cleaning section supplies water greatly.
Method of the present invention except that using, also can be widely used in other flue gas waste heat recovery as power industry in continuous annealing furnace.
Description of drawings
Fig. 1 recycles schematic diagram the second time of continuous annealing furnace flue gas exhaust heat.
Among the figure: 1-cools back water pipe, and 2-storage tank, 3-are mended new water pipe, the 4-magnetic valve, 5-liquid level sensor, the 6-first input water pipe, 7-first check-valves, 8 one the first water pumps, 9-first valve, the 10-second input water pipe, 11-second check-valves, 12-second water pump, 13-second valve, 14-heat exchanger, 15-first drain valve, 16-the 3rd valve, 17-bypass pipe, 18-by-passing valve, 19-exports water pipe, 20-second drain valve, 21-the 4th valve, 22-the 3rd delivery pipe, 23-the 5th valve, 24-overflow pipe, 25-flue gas input pipe, 26-flue gas efferent duct, 27-hot water rinse bath.
The specific embodiment
The method that the continuous annealing furnace flue gas exhaust heat is recycled for the second time: the low-temperature flue gas after the continuous annealing furnace flue gas exhaust heat recycled for the first time by the second time recycling system heat exchanger with the annealing furnace water cooled rolls carried out cooled cooling backwater (be annealed the stove water cooled rolls and be heated to about 50 ℃) carry out heat exchange, described cooling backwater carries out the heat exchange back (being heated to 60 ℃ or higher) of heating up through heat exchanger and sends into cleaning section and use.
The temperature of described low-temperature flue gas is 380～420 ℃.
As shown in Figure 1, recycling system comprised and cooled back water pipe 1 described second time, storage tank 2, mend new water pipe 3, magnetic valve 4, liquid level sensor 5, the first input water pipe 6, first check-valves 7, first water pump 8, first valve 9, the second input water pipe 10, second check-valves 11, second water pump 12, second valve 13, heat exchanger 14, first delivery pipe, first drain valve 15, the 3rd valve 16, bypass pipe 17, by-passing valve 18, output water pipe 19, second delivery pipe, second drain valve 20, the 4th valve 21, the 3rd delivery pipe 22, the 5th valve 23, overflow pipe 24, flue gas input pipe 25, flue gas efferent duct 27; The input termination that cools back water pipe 1 is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output that cools back water pipe 1 is connected with storage tank 2, mend the input termination supplementing water source of new water pipe 3, the output of mending new water pipe 3 is connected with storage tank 2, mend new water pipe 3 and be provided with magnetic valve 4, storage tank 2 is provided with liquid level sensor 5; The input of the first input water pipe 6 is connected with storage tank 2, the output of the first input water pipe 6 is connected with the aqueous medium input port of heat exchanger 14, be provided with first valve 9, first water pump 8, first check-valves 7, the 3rd valve 16 successively on the first input water pipe 6, first valve 9 is near storage tank 2, the three valves 16 close heat exchangers 14; The input of output water pipe 19 is connected with the aqueous medium delivery outlet of heat exchanger 14, and the output of output water pipe 19 is connected with the hot water rinse bath 27 that is used for the cleaning section use, and output water pipe 19 is provided with the 4th valve 21, the four valves 21 near heat exchangers 14; Low-temperature flue gas after the continuous in succession annealing furnace fume afterheat of the input of flue gas input pipe 25 is recycled for the first time, the output of flue gas input pipe 25 is connected with the flue gas medium input port of heat exchanger 14, and the flue gas medium delivery outlet of heat exchanger 14 connects a flue gas efferent duct 27.
Be provided with second valve 13, second water pump 12, second check-valves, 11, the second valves 13 on the input of described first valve 9 one second input water pipe in parallel 10, the second input water pipes 10 successively near storage tank 2 with the output of first check-valves 7.
The described first input water pipe 6 is connected a bypass pipe 17 with exporting between the water pipe 19, and bypass pipe 17 is provided with by-passing valve 18.
Be connected to first delivery pipe on the described first input water pipe 6, the input of first delivery pipe is between the aqueous medium input port and the 3rd valve 16 of heat exchanger 14, and first delivery pipe is provided with first drain valve 15; Be connected to second delivery pipe on the output water pipe 19, the input of second delivery pipe is between the aqueous medium delivery outlet and the 4th valve 21 of heat exchanger 14, and second delivery pipe is provided with second drain valve 20.
The bottom of described storage tank 2 is connected with the input of the 3rd delivery pipe 22, the output of the 3rd delivery pipe 22 ditch of running in, and the 3rd delivery pipe 22 is provided with the 5th valve 23, the five valves 23 near storage tanks 2; The overfall of storage tank 2 connects the input of overflow pipe 24, and the output of overflow pipe 24 is connected with the 3rd delivery pipe 22.
Heat exchanger adopts the band fin-tube heat exchanger.
The water side:
Cooling backwater (is that cooling water cools off the annealing furnace water cooled rolls from the waste water of NOF water cooled rolls discharging mainly, the backwater that is produced, or title waste water), about 50 ℃ of this part coolant-temperature gage, because of not satisfying service condition directly discharging usually, now be recycled to the water source of storage tank 2 as this residual neat recovering system by cooling back water pipe 1; Storage tank 2 is provided with new water supply contact simultaneously, to guarantee the cleaning section water consumption, this node is provided with magnetic valve 4, and form closed-loop controls with the liquid level sensor 5 of storage tank, magnetic valve 4 is opened automatically and is replenished new water when storage tank 2 liquid levels are lower than the low level setting value, attains to a high place to set value until water level and closes magnetic valve; Storage tank 2 also designs overflow mechanism (overflow pipe), can directly unnecessary water be drained into the waste effluent flume by overflow mechanism when water cooled rolls discharge water flow is big.
By first water pump 8 (or second water pump 12, standby) water of storage tank 2 is squeezed into heat exchanger 14, water pump is that the using and the reserved are arranged, after cooling backwater enters heat exchanger 14, by heat exchanger its temperature is risen to 60 ℃; The import and export of heat exchanger 14 water sides respectively are provided with 1 cover thermocouple and are used to detect water temperature, are provided with 1 pressure switch at heat exchanger water side outlet simultaneously, report to the police when detecting pressure anomaly, and whether this pressure switch mainly detects heat exchanger and leak.
Cause a hidden trouble just in case take place to reveal in order to prevent the water in the Tube Sheet of Heat Exchanger, in the import and export of heat exchanger water side bypass system is set, when water pipe leaks or other reason when causing not possessing the water flowing condition, make water directly flow to cleaning section without heat exchanger, can discharge the water in the Tube Sheet of Heat Exchanger simultaneously.
Fume side:
Low-temperature flue gas (400 ℃ of flue gases) enters heat exchanger (5) with after the water heating, flue-gas temperature is reduced to about 180 ℃, this temperature has satisfied the smoke exhaust fan requirement, thereby do not need to mix a large amount of cold wind, simultaneously because temperature reduces the minimizing of flue gas actual flow, in view of these two factors, the type selecting of smoke exhaust fan can reduce, and operating cost also decreases.
The heat exchanger smoke entrance is respectively established a cover thermocouple, is used to detect the smoke entrance temperature.
Claims (7)
1. the method recycled for the second time of continuous annealing furnace flue gas exhaust heat, it is characterized in that: the low-temperature flue gas after the continuous annealing furnace flue gas exhaust heat is recycled for the first time by the second time recycling system heat exchanger with the annealing furnace water cooled rolls carried out cooled cooling backwater carry out heat exchange, described cooling backwater carries out sending into cleaning section after heat exchange heats up through heat exchanger to be used.
2. the method that continuous annealing furnace flue gas exhaust heat according to claim 1 is recycled for the second time is characterized in that: the temperature of described low-temperature flue gas is 380～420 ℃.
3. the method that continuous annealing furnace flue gas exhaust heat according to claim 1 is recycled for the second time is characterized in that: described second time recycling system comprise cool back water pipe (1), storage tank (2), mend new water pipe (3), magnetic valve (4), liquid level sensor (5), the first input water pipe (6), first check-valves (7), first water pump (8), first valve (9), heat exchanger (14), the 3rd valve (16), output water pipe (19), the 4th valve (21), flue gas input pipe (25), flue gas efferent duct (27); The input termination that cools back water pipe (1) is carried out cooled cooling backwater to the annealing furnace water cooled rolls, the output that cools back water pipe (1) is connected with storage tank (2), mend the input termination supplementing water source of new water pipe (3), the output of mending new water pipe (3) is connected with storage tank (2), mend new water pipe (3) and be provided with magnetic valve (4), storage tank (2) is provided with liquid level sensor (5); The input of the first input water pipe (6) is connected with storage tank (2), the output of the first input water pipe (6) is connected with the aqueous medium input port of heat exchanger (14), be provided with first valve (9), first water pump (8), first check-valves (7), the 3rd valve (16) successively on the first input water pipe (6), first valve (9) is near storage tank (2), and the 3rd valve (16) is near heat exchanger (14); The input of output water pipe (19) is connected with the aqueous medium delivery outlet of heat exchanger (14), the output of output water pipe (19) is connected with the hot water rinse bath (27) that is used for the cleaning section use, output water pipe (19) is provided with the 4th valve (21), and the 4th valve (21) is near heat exchanger (14); Low-temperature flue gas after the continuous in succession annealing furnace fume afterheat of the input of flue gas input pipe (25) is recycled for the first time, the output of flue gas input pipe (25) is connected with the flue gas medium input port of heat exchanger (14), and the flue gas medium delivery outlet of heat exchanger (14) connects a flue gas efferent duct (27).
4. the method that continuous annealing furnace flue gas exhaust heat according to claim 3 is recycled for the second time, it is characterized in that: the input of described first valve (9) one second input water pipe (10) in parallel with the output of first check-valves (7), be provided with second valve (13), second water pump (12), second check-valves (11) successively on the second input water pipe (10), second valve (13) is near storage tank (2).
5. the method that continuous annealing furnace flue gas exhaust heat according to claim 3 is recycled for the second time, it is characterized in that: the described first input water pipe (6) is connected a bypass pipe (17) with exporting between the water pipe (19), and bypass pipe (17) is provided with by-passing valve (18).
6. the method that continuous annealing furnace flue gas exhaust heat according to claim 3 is recycled for the second time, it is characterized in that: be connected to first delivery pipe on the described first input water pipe (6), the input of first delivery pipe is positioned between the aqueous medium input port and the 3rd valve (16) of heat exchanger (14), and first delivery pipe is provided with first drain valve (15); Be connected to second delivery pipe on the output water pipe (19), the input of second delivery pipe is positioned between the aqueous medium delivery outlet and the 4th valve (21) of heat exchanger (14), and second delivery pipe is provided with second drain valve (20).
7. the method that continuous annealing furnace flue gas exhaust heat according to claim 3 is recycled for the second time, it is characterized in that: the bottom of described storage tank (2) is connected with the input of the 3rd delivery pipe (22), the output of the 3rd delivery pipe (22) ditch of running in, the 3rd delivery pipe (22) is provided with the 5th valve (23), and the 5th valve (23) is near storage tank (2); The overfall of storage tank (2) connects the input of overflow pipe (24), and the output of overflow pipe (24) is connected with the 3rd delivery pipe (22).
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| CN2010106089364A CN102012169B (en) | 2010-12-28 | 2010-12-28 | Method for secondarily recycling smoke gas waste heat of continuous annealing furnace |
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| CN2010106089364A CN102012169B (en) | 2010-12-28 | 2010-12-28 | Method for secondarily recycling smoke gas waste heat of continuous annealing furnace |
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| CN102012169B CN102012169B (en) | 2013-02-27 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589308A (en) * | 2012-03-15 | 2012-07-18 | 机械工业第六设计研究院有限公司 | Waste heat recycling system of industrial furnaces |
| CN108026606A (en) * | 2016-08-19 | 2018-05-11 | 普锐特冶金技术日本有限公司 | Continuous annealing apparatus |
| CN109972154A (en) * | 2019-03-28 | 2019-07-05 | 浙江沪新不锈钢制造有限公司 | A kind of processing of pickling steel pipe hot-tub and treatment process |
| CN110172565A (en) * | 2018-06-28 | 2019-08-27 | 镕凝精工新材料科技(上海)有限公司 | A kind of bell type annealing furnace waste heat recycling system |
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2010
- 2010-12-28 CN CN2010106089364A patent/CN102012169B/en not_active Expired - Fee Related
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Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589308A (en) * | 2012-03-15 | 2012-07-18 | 机械工业第六设计研究院有限公司 | Waste heat recycling system of industrial furnaces |
| CN108026606A (en) * | 2016-08-19 | 2018-05-11 | 普锐特冶金技术日本有限公司 | Continuous annealing apparatus |
| CN110172565A (en) * | 2018-06-28 | 2019-08-27 | 镕凝精工新材料科技(上海)有限公司 | A kind of bell type annealing furnace waste heat recycling system |
| CN109972154A (en) * | 2019-03-28 | 2019-07-05 | 浙江沪新不锈钢制造有限公司 | A kind of processing of pickling steel pipe hot-tub and treatment process |
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